Oil Pressure Switch − Maintenance Practices; Install Oil Pressure Switch - De Havilland DASH8 100 Series Maintenance Manual

OIL PRESSURE SWITCH − MAINTENANCE PRACTICES
1. General
The maintenance procedure that follows is for the removal and the installation of the oil
pressure switch. The oil pressure switch is installed on the oil tank adjacent to the sight glass.
The procedure is the same for the left engine and the right engine.
2. Removal/Installation
Refer to Figure 201 or Figure 202.
A. Remove Oil Pressure Switch
WARNING:
(1) Open the main gear doors and install the doors lock pin (Refer to Chapter 32).
(2) Remove the lower forward nacelle cowl (Refer to Chapter 71−10−00).
(3) Remove the left side center panel 413 AL (engine No. 1) or 423 AL (engine No. 2)
(Refer to Chapter 71−10−00).
(4) Obey all the electrical/electronic safety precautions (Refer toChapter 24−00−00).
(5) Disconnect the electrical connector (1) from the oil pressure switch (2).
(6) Put a protective cover on the electrical connector (1).
(7) Put a container below the tubes (3) and (4) to collect the oil drain.
(8) Disconnect the tubes (3) and (4) from the oil pressure switch (2).
(9) Put the protective caps on the open ends of the tubes (3) and (4).
(10) Hold the oil pressure switch (2) and remove the nuts (5), washers (6) and screws
(7) from the bracket (8).
(11) Remove the oil pressure switch (2) from the bracket (8).
(12) Put the protective caps on the open ends of the oil pressure switch (2).
B.

Install Oil Pressure Switch

(1) Make sure that the aircraft is in the same configuration as in the removal task.
(2) Remove the protective caps from the oil pressure switch (2) and from the tubes (3)
and (4).
(3) Put the oil pressure switch (2) in the bracket (8) with screws (7), washers (6) and
nuts (5).
(4) Tighten the screws (7).
(5) Connect the tubes (3) and (4) to the oil pressure switch (2) (Refer to Chapter
20−06−03).
(6) Remove the protective cover from the electrical connector (1).
(7) Connect the electrical connector (1) to the oil pressure switch (2).
(8) Do the engine start procedure for the related engine (Refer to Chapter 71−00−00).
(9) Examine all the connections at the oil pressure switch and at the tube assemblies
for signs of oil leaks.
MASTER
EFFECTIVITY:
D
S ERIES 100
AIRCRAFT MAINTENANCE MANUAL
MAIN GEAR DOOR LOCK PINS MUST BE INSTALLED IN THE
GROUND LOCK PROVISION BRACKETS PRIOR TO WORKING IN
THE MAIN WHEEL WELL. FAILURE TO OBSERVE THIS
WARNING COULD RESULT IN FATAL OR SERIOUS INJURY.
79−36−01
Page 201
Jan 15/2010